Wow, what a difference! Definitely want to put these on my car! Has it changed handling at all? Apparently, there are two kinds of spacer kits. Any recommendations?

Yes it definitely is a large difference, handling is improved due to a wider track, I also do an alignment to make sure the toe is readjusted to spec. Z1 has never done me wrong, bolt on spacers are easy to install but if room is limited due to wheels or thickness of spacer then lug bolt replacement is necessary, just make sure they are hub centric.